Straightway valve



(No Model.)

T. J. LOFTUS.

. STRAIGHTWAY VALVE.

No. 248,482. Patented 0012.18, 1881.

ATTQRNBSFS.

UNITED STATES PATENT OFFICE.

THOMAS J. LOFTUS, OF SACRAMENTO, CALIFORNIA.

STRAIG HTWAY VALVE.

SPECIFICATION forming part of Letters Patent No. 248,482, dated October 18, 1881.

Application filed July 18, 1881.

To all whom it may concern:

Be it known that I, THOMAS J. LOFTUS, of

the city and county of Sacramento, California, have invented an Improved Straightway Valve, of which the following is a specification.

The object of my invention is to provide a new and improved straightway valve which will close very tightly, and in which the slides or gates will not grind on the sides of the casing.

Thcinvention consists in avalve casing with two ports, one at each end, and with a projection at each side, this casing containing two sliding gates with conical recesses in the adjoining sides, which recesses contain a conical wedge swiveled in the lower end of the screw valve-stem, which is provided at its lower end with an annular flange, also contained within the recesses and overlapped by shoulders at the upper ends of the gates. The gates are lowered by means of the valve-stem until they rest on the projections of the casing, and are then spread and pressed against the ends of the casing by the swiveled conical wedge, so that they will close the ports tightly.

In the drawings, Figure l is a longitudinal sectional elevation of my improved valve. Fig. 2 is a cross-sectional elevation of the same. Fig. 3 is an elevation of the inner side of one of the gates. Fig. 4 is a plan view of the under side of the gates.

Similar letters of reference indicate correspondingparts.

The valve casing or box A is provided with the ports B B in the ends 0 O, and with inter nal projections, D I), in the sides, and with a screw-neck, E, for the screw valve-stem F, provided with a hand-wheel, G. This valve-casing contains two sliding gates, H,with smooth outer surfaces, and with beveled orinverted conical recesses J in the inner or adjoiningsurfaces, with a shoulder, K, at the upper end of the recess, andshouldersNatthesides. Aconical wedge, L, is swiveled to the lower end of the valvestem F, provided at its lower end with an annular flange, M. This conical wedge Land the annular flange M are contained in the aperture formed by the two recesses J, the shoulders K overlapping the flanges M, as shown. The conical wedge L may be rigidly attached to the lower end of the stem, but I prefer to swivel it.

The operation is as follows: If the handwheel G is turned from left to right the stem or rod F descends, as do likewise the gates H,

. in use heretofore.

(No model.)

until the shoulders N N of the gates rest on the internal projections D of the casing A, therebyclosingtheportsB. Ifthehand-wheel is still turned the gates H cannot descend any farther on account of the projections D, but the wedge L descends and presses the gates H against the ends 0 of the casing A, as indicated by the arrows, and thus closes the ports B very tightly. -If the hand-wheel G is turned from right to left the conical wedge L will first rise and then the flange M, which catches on the shoulders K of the gates H, draws these gates upward and thus opens the ports. The gates cannot grind on the inner surfaces of the ends of the casing, as their movement is only a lateral one when they are pressed against the ends of the casing, and replaning the outer surfaces will not cause them to drop any lower than before, as itdoesin the straightway valves As the wedge L is swiveled to the lower end of the stem F it will not grind on the surfaces of the recesses J when the stem F is turned, and only the upper annular surface of the wedge grinds on the lower annular surface of the stem, and then these two surfaces can wear off gradually without affecting the closejoint of the valve.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1 In a straightway valve, the combination, with the casing A, provided with valve-seats O G and ports B B, of the gates H H, provided with recesses J, shoulders K, conical wedge L, and valve-stem F, substantially as herein shown and described.

2. In a straightway valve, the combination, with the gates H, provided with recesses J and shoulders K on their inner and adjoining surfaces, of the conical wedge L and valve-stem F, substantially as herein shown and described.

3. In a straightway valve, the combination, with the casing A, provided with internal projections, D,ot' the gates H,provided with shoulders N in the sides, and shoulders K, and conical recesses J in the adjoining inner surfaces, of the valve-stem F, and the conical wedge L, swiveled to its lower flanged end, substantially as herein shown and described, and for the purpose set forth.

THOS. J. LOFTUS.

Witnesses:

OSCAR F. GUNZ, O. SEDGWICK. 

